Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
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Nettie Maria Stevens (1861-1912) was a pioneering American biologist known for her groundbreaking research on genetics and cytology. Her work on the chromosomal theory of inheritance laid the foundation for modern genetics. Stevens's contributions to understanding sex determination and chromosomal behavior were instrumental in shaping the field of genetics.
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